Antenna or similar article



FIG. 1 is a top plan view of an antenna showing my new design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a left side elevation view thereof, the right side being a mirror image.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an antenna or similar article, as shown and described. 